Available for Sale Marketable Debt Securities (Tables)

12 Months Ended

Dec. 31, 2014

Available-for-sale Securities [Abstract]

Summary of Amortized Cost and Estimated Fair Value of Available for Sale Marketable Debt Securities

Available for sale marketable debt securities are generally classified as current on our consolidated balance sheet.

The following is a summary of amortized cost and estimated fair value of our investments in marketable debt securities available for sale at December 31, 2013 ($ amounts in thousands):

			Unrealized				Estimated Fair Value
	Cost		Gain		(Loss)
Corporate bonds		$3,522		$19		$—		$3,541